JP3758565B2 - Rotating electric machine for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular rotating electrical machine that is mounted on a passenger car, a truck, and the like, and that cools a heat generating part by circulating a cooling medium therein.
[0002]
[Prior art]
In recent years, the magnetic noise of auxiliaries has been highlighted as engine noise has been reduced. As a technique for reducing the magnetic noise of auxiliaries, Japanese Patent Laid-Open No. 59-209053 discloses that a soft damping member such as a rubber material is interposed between a stator core of a vehicle AC generator and a housing. Thus, there is disclosed a technique for suppressing the resonance noise by attenuating the vibration of the stator core and not transmitting it to the housing.
[0003]
On the other hand, the engine room is becoming narrower due to the slant nose of the vehicle and securing of the interior space of the vehicle, and the operating temperature conditions of the auxiliary machines mounted in the engine room are becoming more severe. Japanese Patent Publication No. 5-16261 discloses a technique for improving the temperature conditions of auxiliary machinery by flowing engine cooling water through a coolant passage provided in a housing of an AC generator for a vehicle, an armature coil, a rectifier, etc. A technique for cooling the electrical components is disclosed.
[0004]
[Problems to be solved by the invention]
By the way, in the vehicle AC generator disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-209053, the stator core and the damping member are in thermal contact with each other. Due to the heat generation and Joule heat of the stator coil, the damping member becomes high temperature. For this reason, the damping action decreases with the deterioration of the mechanical properties of the damping member, and the holding force of the stator core decreases and the stator core is pulled by the rotor's magnetic force and rotates. There was a problem that. In order to avoid this problem, it is conceivable to use a heat-resistant material that does not deteriorate the mechanical properties even in a high temperature state. However, since this leads to an increase in cost, it is difficult to adopt it considering the recent demand for cost reduction.
[0005]
In the above-mentioned AC generator disclosed in Japanese Patent Publication No. 5-16261, the cooling performance of electrical parts such as armature coils and rectifiers is improved, but measures are taken for magnetic noise. Therefore, there is a high possibility that the magnetic noise of the vehicular AC generator will be a problem against the recent quietness of engine noise. In addition, in order to maintain the outer dimensions and axial dimensions of the vehicle alternator, the cooling water flow path is formed by reducing the wall thickness of the housing, compared to a normal air-cooled vehicle alternator. Therefore, it is conceivable that the rigidity of the housing is lowered and the magnetic noise is deteriorated.
[0006]
The present invention has been created in view of the above points, and an object of the present invention is to provide a vehicular rotating electrical machine that can suppress a rise in temperature of a damping member and reduce magnetic noise. is there.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a rotating electrical machine for a vehicle according to the present invention includes a stator having a stator iron core and an armature coil wound around the stator iron core, and a field arranged to face the stator. A rotor having an iron core and a field coil; a stator and a housing that supports the rotor; and a vibration damping member interposed between the stator iron core and the housing, wherein the vibration damping member and the stator core A first cooling medium passage for circulating the cooling medium is formed therebetween. Since the first cooling medium passage is formed between the damping member and the stator core, the stator core can be cooled and the temperature rise of the damping member can be suppressed. The mechanical properties of the damping member It is possible to suppress the deterioration of the damping, to suppress the lowering of the damping action and to prevent the stator from rotating. Further, since the damping member is disposed between the stator core and the housing, the vibration of the stator can be suppressed, and the magnetic noise can be reduced. In addition, when there is a cooling medium passage other than the first cooling medium passage disposed between the vibration damping member and the stator core, these cooling medium passages may be connected to each other or independently. It may be. In this case, it is desirable to distribute the cooling medium preferentially through the first cooling medium passage. Since the cooling medium flowing through the first cooling medium passage is not affected by the temperature rise of the cooling medium flowing through the second cooling medium passage, the damping member can be efficiently cooled.
[0008]
Moreover, it is desirable that the above-described vibration damping member is formed with a hollow portion serving as a first cooling medium passage. Since the damping member can be directly cooled from the inside, the temperature rise of the damping member can be suppressed more effectively.
In addition, the above-described vibration damping member can be configured by bonding two plate-shaped vibration damping bodies in which a concave portion serving as a first cooling medium passage is formed on at least one side. The degree of freedom of shape of the first cooling medium passage is increased, and the vibration damping member can be efficiently cooled. In addition, it is desirable that the first cooling medium passage is inserted into the damping member by bonding two plate-like bodies harder than the damping member. Deformation of the first coolant passage during assembly of the stator can be prevented.
[0009]
Further, it is desirable that the heat conductive resin is provided between the coil end of the armature coil and the housing, and the second cooling medium passage is disposed so as to contact the side opposite to the coil end of the heat conductive resin. . Thereby, the heat generated at the coil end of the armature coil can be efficiently transmitted to the cooling medium in the second cooling medium passage.
[0010]
Further, it is desirable to further include a rectifier attached to the axial end face outside the housing described above, and to dispose the second cooling medium passage on the opposite side of the rectifier in the axial direction across the housing. Thereby, the heat generated in the rectifier can be efficiently transmitted to the cooling medium in the second cooling medium passage through the housing.
[0011]
In addition, it is desirable to further include a voltage regulator attached to the axial end surface outside the housing described above, and to dispose the second cooling medium passage on the opposite side of the voltage regulator in the axial direction across the housing. Thereby, the heat generated by the voltage regulator can be efficiently transferred to the cooling medium in the second cooling medium passage through the housing.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an automotive alternator according to a first embodiment to which the present invention is applied will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing the overall configuration of the vehicle alternator of the first embodiment. FIG. 2 is a partially enlarged sectional view of the vehicle alternator of this embodiment.
[0013]
The vehicle alternator according to this embodiment includes a front housing 1, a rear housing 2, a damping member 5, a stator 6, a rotor 10, a rectifier 13, a voltage regulator 14, a brush device 15, and a rear cover 16. It is configured to include.
The front housing 1 and the rear housing 2 are both made of aluminum die cast and formed in a bowl shape, and are tightened with a plurality of bolts (not shown) in a state where these openings are in direct contact with each other. They are fixed to each other.
[0014]
The stator 6 is fixed to the inner peripheral surface of the front side housing 1 in the axial direction side portion with the damping member 5 and the cooling medium passage 41 interposed therebetween. The vibration damping member 5 is formed of an annular soft resin material, and is assembled between the inner peripheral surface of the front housing 1 and the outer peripheral surface of the cooling medium passage 41 with a predetermined allowance. .
[0015]
The stator 6 includes a stator core (stator iron core) 61 and armature coils 62 provided in a plurality of slots formed in the stator core 61. An armature coil 62 protrudes from both axial end surfaces of the stator core 61 to form a coil end. Between the protruding armature coil 62 and the inner wall surface of the front housing 1 and the rear housing 2. A space between the inner wall surface and the inner wall surface is filled with a high thermal conductive resin (thermal conductive resin) 7 mixed with a filler.
[0016]
The rotor 10 includes a field coil 101, pole cores (field cores) 102 and 103, and a shaft 105. The rotor 10 is formed by press-fitting the shaft 105 with the field coil 101 sandwiched between the pole cores 102 and 103. A pair of slip rings 106 and 107 are formed in the vicinity of the rear side end of the shaft 105, and are electrically connected to both ends of the field coil 101.
[0017]
A cylindrical bearing box 8 is formed integrally with the front housing 1 described above. Further, an iron bearing box 9 is attached to the rear housing 2 with bolts (not shown). A pair of bearings 11 and 12 are accommodated in each of the bearing boxes 8 and 9, and the rotor 10 is rotatably held by these bearings 11 and 12.
[0018]
In addition to the above-described cooling medium passage 41 provided between the damping member 5 and the stator core 61, the cooling medium passage 42 is provided in the front housing 1, and the cooling medium passage 43 is provided in the rear housing 2. , 44 are formed. The cooling medium passage 42 is an axial wall portion of the front housing 1 and is formed in a portion with which the high thermal conductive resin 7 is in contact. The cooling medium passage 43 is an axial wall portion of the rear housing 2 and is formed at a portion where the high thermal conductive resin 7 is in contact. Further, the cooling medium passage 44 is formed in the axially vertical wall surface of the rear housing 2.
[0019]
In addition, electrical components such as a rectifier 13, a voltage regulator 14, and a brush device 15 are fixed to the outer axial end surface of the rear housing 2 using bolts or the like, and the outer side of the rear cover 16 is made of a steel plate. Covered by.
In the vehicle alternator having the above-described structure, the rotor 10 rotates in a predetermined direction when a rotational force from an engine (not shown) is transmitted to the pulley 20 via a belt or the like. By applying an excitation voltage to the field coil 101 of the rotor 10 in this state, the respective claws of the pole cores 102 and 103 are excited, and a three-phase AC voltage can be generated in the armature coil 62. A predetermined DC power is taken out from the output terminal of the device 13.
[0020]
In such a power generation state, an output current flows through the armature coil 62 and the rectifier 13, and an excitation current flows through the voltage regulator 14. The AC generator for a vehicle according to the present embodiment cools each part accompanied by heat generation by circulating a cooling medium in each of the cooling medium passages 41, 42, 43, 44. For example, engine cooling water is used as a cooling medium to be circulated through the cooling medium passage 41 and the like.
[0021]
The cooling medium passage 41 is provided with a cooling medium inlet 400 and a cooling medium discharge port (not shown), and the engine coolant taken in from the cooling medium inlet 400 flows through the cooling medium passage 41. And discharged from the cooling medium outlet. The cooling medium passage 41 is disposed between the stator core 61 whose temperature has increased and the vibration damping member 5, and has an effect of suppressing heat transfer to the vibration damping member 5. It is possible to improve the cooling performance.
[0022]
The same applies to the other cooling medium passages 42 and the like. Specifically, the front side coil end of the armature coil 62 disposed via the high thermal conductive resin 7 can be efficiently cooled by the engine cooling water flowing through the cooling medium passage 42. The engine side coolant flowing through the cooling medium passage 43 can efficiently cool the rear side coil end of the armature coil 62 disposed via the high thermal conductive resin 7. The engine cooling water flowing in the cooling medium passage 44 can efficiently cool the rectifier 13 and the voltage regulator 14 disposed with the rear housing 2 interposed therebetween.
[0023]
As described above, in the vehicle alternator of this embodiment, the damping member 5 can be efficiently cooled by circulating the cooling medium through the cooling medium passage 41 disposed on the inner periphery thereof. Therefore, it can suppress that the damping member 5 becomes high temperature, and a mechanical property deteriorates, and it can prevent that the stator 6 rotates. In addition, since the damping member 5 maintains flexibility, the damping action can be effectively functioned, so that the vibration of the stator 6 can be suppressed and the generation of magnetic noise can be minimized. .
[0024]
Further, since the high thermal conductive resin 7 is provided between the coil end of the armature coil 62 and the housings 1 and 2, the heat generated at the coil end of the armature coil 62 is efficiently contained in the cooling medium passages 42 and 43. Can be transmitted to the cooling medium.
In addition, since the cooling medium passage 44 is disposed on the opposite side in the axial direction of the rectifier 13 and the voltage regulator 14 with the rear housing 2 interposed therebetween, the heat generated in the rectifier 13 and the voltage regulator 14 is transferred to the rear side. The cooling medium can be efficiently transmitted to the cooling medium in the cooling medium passage 44 through the housing 2.
[0025]
Further, in the vehicle alternator of this embodiment, each of the cooling medium passages 41, 42, 43, and 44 is disposed separately, and it is desirable to distribute the cooling medium separately thereto. In this way, by circulating the cooling medium separately in each cooling medium passage, it is possible to prevent the cooling medium from flowing through the cooling medium passage disposed in the vicinity of the low temperature portion. It is possible to efficiently cool each part having a different temperature.
[0026]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the cooling medium passage 41 is formed separately from the vibration damping member 5, but a hollow portion may be used as the cooling medium passage by using a hollow vibration damping member.
[0027]
FIG. 3 is a cross-sectional view showing the overall configuration of the vehicle alternator according to the second embodiment. FIG. 4 is a partially enlarged sectional view of the vehicle alternator shown in FIG. The vehicle alternator according to another embodiment shown in these figures has the vibration damping member 5 and the cooling medium passage 41 in combination with these functions as compared with the vehicle alternator shown in FIGS. The difference is that the vibration damping member 51 is replaced. Hereinafter, the vibration damping member 51 and the structure in the vicinity thereof will be described. Components other than the damping member 51 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0028]
A hollow portion serving as a cooling medium passage 45 is formed on the inner peripheral surface of the front side housing 1 in the axial direction, and the stator 6 is fixed with a damping member 51 interposed therebetween. The damping member 51 is a hollow annular soft resin, and is assembled with a predetermined tightening margin between the front housing 1 and the stator 6. Since the vibration damping member 51 can be directly cooled from the inside by circulating the cooling medium in the hollow portion, the temperature of the vibration damping member 51 can be effectively lowered.
[0029]
FIG. 5 is a partial enlarged cross-sectional view of the vehicle alternator of the third embodiment. This embodiment is different in that the vibration damping member 5 is replaced with an improved vibration damping member 52 with respect to the vehicle AC generator shown in FIGS. 3 and 4. Hereinafter, the structure of the vibration damping member 52 will be described. Further, parts other than the damping member 52 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0030]
The damping member 52 is configured by bonding two plate-like damping bodies 521 and 522 in which a concave portion that becomes the cooling medium passage 45 is formed on one surface. In the present embodiment, the concave portions are formed on both sides, but it goes without saying that the cooling medium passage 45 can also be configured when formed on only one side.
[0031]
The vibration damping member 52 is wound around the outer periphery of the stator core 61 and assembled with a predetermined tightening allowance provided on the inner peripheral surface of the front housing 1. In addition, as shown in FIG. 6, the cooling medium passage 45 may be configured by plate-like bodies 531 and 532 that are harder than the vibration damping member 53 and inserted into the vibration damping member 53. In this case, when the stator 6 is assembled, the cooling medium passage 45 can be prevented from being deformed, and the cooling medium can be circulated stably.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an overall configuration of a vehicular AC generator according to a first embodiment.
FIG. 2 is a partial enlarged cross-sectional view of the vehicle alternator shown in FIG.
FIG. 3 is a cross-sectional view showing an overall configuration of a vehicular AC generator according to a second embodiment.
4 is a partial enlarged cross-sectional view of the vehicle alternator shown in FIG. 3;
FIG. 5 is a partial enlarged cross-sectional view of a vehicle AC generator according to a third embodiment.
FIG. 6 is a partial enlarged cross-sectional view of a vehicle AC generator according to a fourth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front side housing 2 Rear side housing 5 Damping member 6 Stator 7 High heat conductive resin 10 Rotor 13 Rectifier 14 Voltage regulator 15 Brush device 16 Rear cover

Claims (8)

A stator having a stator core and an armature coil wound around the stator core, a rotor having a field core and a field coil disposed opposite to the stator, the stator and the In a rotating electrical machine for a vehicle, comprising: a housing that supports a rotor; and a damping member that is interposed between the stator core and the housing.
A rotating electrical machine for a vehicle, wherein a first cooling medium passage through which a cooling medium flows is formed between the vibration damping member and the stator core. In claim 1,
A rotating electrical machine for a vehicle, wherein a hollow portion serving as the first cooling medium passage is formed in the damping member. In claim 1 or 2,
A second coolant passage formed separately from the first coolant passage,
A rotating electrical machine for a vehicle, wherein the cooling medium is circulated through the first cooling medium passage in preference to the second cooling medium passage. In claim 2 or 3,
The vehicular rotating electrical machine is characterized in that the vibration damping member is formed by bonding two plate-shaped vibration dampers having at least one recess formed as the first cooling medium passage. In claim 2 or 3,
The vibration damping member is formed by adhering two plate-like bodies each having a recess serving as the first cooling medium passage on at least one side, and inserting the plate into the vibration damping member. Rotating electric machine for vehicles. In claim 3,
Thermally conductive resin is provided between the coil end of the armature coil and the housing,
A rotating electrical machine for a vehicle, wherein the second cooling medium passage is disposed so as to contact an opposite side of the coil end of the thermally conductive resin. In claim 3,
A rectifier attached to an outer axial end face of the housing;
The vehicular rotating electrical machine characterized in that the second cooling medium passage is disposed on the opposite side in the axial direction of the rectifier with the housing interposed therebetween. In claim 3,
A voltage regulator attached to an outer axial end face of the housing;
The vehicular rotating electrical machine, wherein the second cooling medium passage is disposed on the opposite side in the axial direction of the voltage regulator with the housing interposed therebetween.

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